But critics have accused Uber of flouting competition rules and of not carrying out sufficient safety checks on drivers and their vehicles.

Uber has been hit with court injunctions in Belgium, France, Germany, the Netherlands and Spain, and has faced protests from taxi firms in major cities, including London.

"We want to make 2015 a year where we establish a new partnership with EU cities, where we push for progressive regulation and ensure innovation ..., where we provide massive economic benefits to cities and their economies," Mr Kalanick said.

"How many unemployed people can come on this platform and find a way to make a living, to be part of an economic opportunity," he said.